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The voltmeter doesn't necessarily have to be fed by a switched power source, as long as you feed it downstream of a fuse. Mine runs off an unswitched line and I get to see how low the supply voltage goes when the starter is cranking the engine... More commonly it is run to a switched line, but there's no reason it absolutely *has* to be done that way.
Don't worry about power drain thru constant powering of the meter... current draw is in the micro-amp range.
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In God We Trust. Everyone else, keep your hands where I can see them.
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